Implement first structure of jpg and farbfeld

1 files changed, 42 insertions, 0 deletions

diff --git a/src/bitmap.zig b/src/bitmap.zig
new file mode 100644
index 0000000..9a9f7ac
--- /dev/null
+++ b/src/bitmap.zig
@@ -0,0 +1,42 @@
+const std = @import("std");
+const Allocator = std.mem.Allocator;
+
+pub fn Bitmap(PixelType: type) type {
+    return struct {
+        const Self = @This();
+
+        pixels: []PixelType,
+        width: usize,
+        height: usize,
+
+        /// Creates a new Bitmap instance and allocates the `pixels` buffer.
+        pub fn init_undefined(gpa: Allocator, width: usize, height: usize) !Self {
+            const self: Self = .{
+                .width = width,
+                .height = height,
+                .pixels = try gpa.alloc(PixelType, width * height),
+            };
+
+            return self;
+        }
+
+        pub fn from_buffer(buffer: []PixelType, width: usize, height: usize) Self {
+            return .{
+                .width = width,
+                .height = height,
+                .pixels = buffer,
+            };
+        }
+
+        pub inline fn pixel(self: *Self, x: usize, y: usize) ?*PixelType {
+            return if (x < self.width and y < self.height)
+                self.pixels[x + self.width * y]
+            else
+                null;
+        }
+
+        pub fn deinit(self: Self, gpa: Allocator) void {
+            gpa.free(self.pixels);
+        }
+    };
+}